Special Features:

Two outer edges chamfered 40.0 degrees min to 50.0 degrees max by 0.03 in. Min to 0.05 in. Max deep; two diametrically opposite curvedaxial grooves centered between two drive slots 0.170 in. Min radius to 0.190 in max radius, bottom of groove extends to a depth 0.770 in. Min, 0.790 in. Max from axial center

Properties:

A nut, circular in shape, which may have wrenching facilities such as flats, holes, protrusions, slots or splines in or on the periphery or in the face opposite the bearing surface. For items having a thickness (or height) exceeding two times the outside diameter, use post, electrical-mechanical equipment. See also nut (1), plain, knurled. (when height or thickness and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)